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curl/docs/MQTT.md
Daniel Stenberg a28464ae77
docs: reduce/avoid English contractions 
You're => You are
Hasn't => Has not
Doesn't => Does not
Don't => Do not
You'll => You will
etc

Closes #7930
2021-11-07 23:16:27 +01:00

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MQTT in curl

Usage

A plain "GET" subscribes to the topic and prints all published messages. Doing a "POST" publishes the post data to the topic and exits.

Example subscribe:

curl mqtt://host/home/bedroom/temp

Example publish:

curl -d 75 mqtt://host/home/bedroom/dimmer

What does curl deliver as a response to a subscribe

It outputs two bytes topic length (MSB | LSB), the topic followed by the payload.

Caveats

Remaining limitations:

  • Only QoS level 0 is implemented for publish
  • No way to set retain flag for publish
  • No TLS (mqtts) support
  • Naive EAGAIN handling will not handle split messages